They span some of the most awe-inspiring places on earth, taking cars, cyclists and pedestrians across once-impassable river gorges and even underneath massive lakes. Some were built in a matter of months, while others took more than a decade to complete.

Our look earlier this year at the world's most amazing roads inspired a closer look at the bridges that connect them, many of which were accomplished with feats of architectural imagination that continue to astound decades and centuries later.

Even a few millennia later, like the ancient Romans who built France's Pont-du-Gard.

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